DeathOnFeet claimed that my house in a mountain was his,but it honestly wasnt,

i then went back to my cave house and found my mob spawner gone and when i fixed it all the glass at the bottom of the xp farm was gone, letting all the skeletons into meh base, i asked giga if he would see who destroyed it and it said deathonfeet or what ever his name is, i belive he did it to get back at me, but idk